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Flights from London to Sydney

Flights from London to Sydney take about 21h 30m in the air, usually with a connection, and the two cities are about 17,020 km apart. Compare live prices for your dates below.

Cheapest recent fare

£684

Round trip · 11 Nov – 19 Nov · 1 stop

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Found in the last few days, per person, economy. The provider confirms the final price.

Approx. flying time
About 21h 30m with a connection
Best time to visit Sydney
September to November and March to May

Flight tip: Flights from the US and UK are long; a stopover in Asia or the Pacific can make the journey easier. Read our Sydney guide

London to Sydney flights: quick answers

How long is the flight from London to Sydney?

It’s about 21h 30m in the air, and most trips connect along the way, which adds time on the ground. That’s a rough guide worked out from the 17,020 km between Heathrow and SYD; scheduled times vary by airline and direction, because winds can make one way slower, and a flight with a connection takes longer.

How long is the flight back from Sydney to London?

About the same time in the air, roughly 21h 30m plus the connection, because the distance is the same. High-altitude winds usually make one direction faster than the other, so check the scheduled times in your search results.

How far is Sydney from London?

About 17,020 km (10,580 miles) between Heathrow and SYD, in a straight line. The path a plane flies is usually a little longer.

What is the time difference between London and Sydney?

Sydney is 11 hours ahead of London right now; at other times of year it’s 9 hours ahead or 10 hours ahead, because of daylight saving time.

Which airports can I fly from in London?

Heathrow and Gatwick handle most long-haul flights; Stansted, Luton, London City and Southend serve mainly European routes.

Which airport do I fly into in Sydney?

Kingsford Smith (SYD) is Sydney’s main airport. Other airports and when to go: our Sydney guide

When is the best time to visit Sydney?

September to November and March to May.

What are my rights if my London to Sydney flight is cancelled?

Flights leaving a UK airport are covered by UK rules on any airline. If your flight is cancelled you can choose a refund or another flight, and you may be able to claim compensation if you were told less than 14 days before departure. Compensation depends on the flight’s distance. This route is in the over 3,500km band. UK Civil Aviation Authority: Cancellations (opens in a new tab)

What do I need to enter the country when I fly to Sydney?

Rules change, so check them again shortly before you travel. GOV.UK: Australia entry requirements (opens in a new tab)

Before you fly

Cheapest month to fly from London

  1. Nov 2026£390
  2. Dec 2026£380Cheapest month
  3. Jan 2027£552
  4. Mar 2027£389
  5. Apr 2027£434
  6. May 2027£425
  7. Jun 2027£404
  8. Jul 2027£840
  9. Oct 2027£650

Lowest round-trip fare per person found recently for departures in each month, from London. Months with no recent fare aren’t shown.

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